What Is P0605 Code On 7.3 Powerstroke: How To Fix?

Ford 7.3L Powerstroke PCM provides several diagnostic trouble codes (DTCs) to let users know about the internal difficulties. The P0605 is one of the trouble codes & it’s related to the PCM itself.  

If you’re getting the DTC P0605 & don’t know what it means, this article is for you. I’ll be explaining the error code along with solving methods in step by step manner. Without further ado, let’s get started. 

What Is P0605 Code On 7.3 Powerstroke

What Does P0605 Code Means On 7.3L Powerstroke? 

P0605 is one of the trouble codes of the Ford 7.3 Powerstroke. By definition, this code refers to Internal Control Memory Read-Only Memory Error. 

The Powertrain Control Module (PCM) has built-in RAM like every other computer system. Though general users don’t have access to this Read-Only Memory, the PCM uses this storage on a daily basis. 

When the PCM fails to access/read the Read-Only Memory (RAM), it generates the error code P0605. This can happen due to various reasons such as – lack of power (12V), faulty ground signal & so on. 

Symptoms Of Getting The P0605 Code On A 7.3L Powerstroke

You’ll get some obvious signs that your PCM is having issues within it most of the time. Here are some of the most common symptoms of the DTC P0605. 

  1. CEL (Check Engine Light) is Active
  2. Failed Emissions Inspection
  3. Besides CEL, Traction/ABS control Light May Also Appear
  4. Poor Fuel Economy
  5. Misfiring Engine (Rare Case)
  6. No Symptoms At All (Rare Case, Due To Tunes & Chips)

Expect to have the error code P0605 if you’re getting the symptoms mentioned above. 

The number six symptom isn’t a symptom; I wrote that just because it’s also possible to have the code without any symptom. 

The Causing Factors Of The Error Code P0605   

You may get the error code for various reasons & I’ll discuss them in this section. Here are the most common causing factors of the DTC P0605:

  1. 12V Power is Needed To Read The RAM, If The PCM Lacks In That Amount Of Power Voltage – It Generates The P0605 Code
  2. Defective/Damaged PCM ROM Module 
  3. Defective/Damaged PCM Ground Circuit/s
  4. Defective/Damaged Output Devices Controlled By The PCM
  5. Poor PCM Electrical Connection

Rare causing factors: 

  • Installing Superchip Can Cause This Error Code To Appear
  • If The PCM Is Flashed With Tune, The DTC P0605 Can Occur 

That was all about the causing factors of the DTC P0605. 

How Serious Is Code P0605 On 7.3L Powerstroke? 

If you’re getting visible symptoms of the code P0605, it’s a serious problem for you & needs proper diagnosing. With the DTC P0605, the PCM is yelling it’s dying & needs to be replaced in some cases. 

Try solving this error code as soon as possible if you’re not willing to do the costlier PCM replacement. Check out the next segment to know how to solve the P0605 error code on 7.3L. 

How to Solve P0605 Error Code On 7.3L Powerstroke?

From faulty CPS to faulty PCM, anything can bring the P0605 to life. You’ll have to inspect every possible part to know the actual cause. 

Make sure to have your user manual & proper kit before diving into the P0605 inspection process. 

Check & Replace Your CPS

Crankshaft Pressure Sensor (CPS) monitors the wheel’s RPM & sends the information to the powertrain control module. Later on, the PCM controls the fuel injection, ignition system timing & other engine parameters based on the CPS information. 

If somehow the CPS becomes faulty, you’ll have issues with the fuel injection, poor fuel economy & so on. Try replacing the crankshaft pressure sensor if it’s faulty. Here’s the step by step guide:

  • Step 1: Disconnect The Negative Cables Of The Battery 
  • Step 2: Disconnect The Crankshaft Pressure Sensor Wiring Harness
  • Step 3: Remove The Bolts Holding The CPS 
  • Step 4: Remove The CPS
  • Step 5: Lubricate The New CPS & Install It Gently 

That’s how you can replace your CPS with a new one & this should solve the DTC P0605. If it doesn’t follow the next segment. 

Check & Replace Your Fuel Bowl Heater Fuse 

Fuse is a self-destructive device that destroys itself when the allocated voltage is surpassed. The fuel bowl heater has a fuse, just like most of the engine components. It’s leveled as a #30 fuse & it’s a 30amp fuse. 

Here’s how you can check & replace the fuel heater fuse: 

  • Step 1: Open The Hood & Look For The Main Fuse Box. 
  • Step 2: Remove The Cover From The Fuse Box.
  • Step 3: Locate The #30 Fuse & See if it’s Burnt or not
  • Step 4: Pull The Fuse Off If It’s Burnt & Replace It With A New One

Sometimes a burnt fuse can cause the fuel bowl heater to be faulty if it’s not changed immediately. That’s why you shouldn’t delay changing fuse/s. 

Check & Replace Your IPR

The Injection Pressure Regulator (IPR) is an electromagnetic valve that regulates the high-pressure oil pump or HPOP. Sometimes the IPR may become faulty for various reasons & cause the DTC P0605 to appear. 

Open the hood & replace the IPR Valve. You’ll need safety gloves & a proper screwdriver kit for the operation. Check your user manual to know where the IPR valve is as Ford moves them frequently. 

Replace Your PCM

If the mentioned troubleshooting methods don’t work out for you, suspect the PCM to be faulty. You can’t/shouldn’t replace the PCM on your own as it’s a very tough job. Hire a professional to do the job for you. 

How Much Does It Cost To Solve The Error Code P0605 On 7.3L?

Depending on the replacement parts, the cost of solving the error code P0605 varies from truck to truck. Here is the price list of the potential replacement parts: 

  • CPS Costs $20 to $40
  • IPR Valve Costs $50 to $60
  • PCM Costs Around $500

Add extra $75 to $150 per hour labor fees if you’re getting the solving job done from an auto shop.

Common Mistakes While Solving The P0605 Code

If you’re doing all the work on your own, be cautious & try avoiding these common mistakes mentioned below: 

  • Mistakenly replacing PCM while the problem was with improper voltage
  • Mistakenly replacing PCM while the problem was with defective ground circuits 

Additional Comments To Consider Regarding The P0605 Code 

The error code P0605 can occur for various reasons. Feel free to ignore it if you’re having Superchips in your car. Also, flashing tunes into the PCM can cause P0605 & then it’s safe to ignore. 


I hope this article was helpful enough to know the error code in-depth. Now you know the ins & out of the error code that will help you with diagnosing it. 

Feel free to ask out an expert technician if needed. Other than replacing the PCM, you can do all other mentioned troubleshooting on your own.

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